Reaction kinetics and phase diagram studies in the Ti–Zn system

Diffusion couple studies of the Ti‐Bi‐Zn system

“…The above discussion is necessary, because linear growth kinetics has been found in the Ti-Zn system [25], while there is no information about the growth kinetics of Ti-Bi phase layers, thus a parabolic rate is expected. Although the studies are not intended to obtain kinetic data a coarse assessment of the growth constants (G k ) is possible.…”

“…The isothermal section at 500°C is simplified (the homogeneity ranges of most binary compounds are not considered) and is based on the author's studies and literature data [13,25,[28][29][30][31][32] while the diffusion paths are designed conventionally [8]. a -the liquid/liquid separation has been taken into account (Liq1 is the Zn-rich liquid phase); b -// symbolizes discontinuity in the observed diffusion path (i.e.…”

Phase diagram studies of the Ti–Bi–Zn system

“…However, the formation of zinc-dew on the [26]. f Similar to DO 19 , but with lower than hexagonal symmetry [24].…”

“…Considering the binary end-systems one should be aware that the Bi-Zn system is well studied [2][3][4][5][6][7][8], while Ti-Zn [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] and the Bi-Ti [7,8,[24][25][26][27][28][29] phase diagrams are known only roughly (Table 1).…”

First-Principles Phase Stability Calculations of Pseudobinary Alloys of (Al,Zn)3Ti with L12, D022, and D023 Structures

“…The results are given in Table I, along with the calculated zero-temperature formation energies (∆E f ), defined as the difference in energy between the compound and the concentration-weighted average of the energies of the constituent atomic species in the reference crystal structures given in the Table caption. Considering specifically the formation-energy values, we note that, consistent with the results of earlier calculations (discussed in detail elsewhere 12 ), DO 23 is calculated to be the ground state (i.e., the lowest-energy structure at zero temperature) for the Al 3 Ti composition. The crystal chemistry of Zn-Ti intermetallics has been summarized by Vassilev et al 20 , and L1 2 -Zn 3 Ti is known to be stable at low temperature, while the tetragonal structures DO 22 and DO 23 have not been observed. Consistent with these observations, we find that L1 2 -Zn 3 Ti is the ground state structure whereas DO 22 and DO 23 have significantly higher energies 21 .…”